Climate signatures on decadal to interdecadal time scales as obtained from mollusk shells (Arctica islandica) from Iceland
Climate signatures on decadal to interdecadal time scales as obtained from mollusk shells (Arctica islandica) from Iceland
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DOI：
10.1016/j.palaeo.2012.08.006
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发表时间：
2013-03-01
影响因子：
3
通讯作者：
Schoene, Bernd R.
中科院分区：
文献类型：
--
作者：
Lohmann, Gerrit;Schoene, Bernd R.
根据冰岛的海洋双壳类软体动物Arctica islandica的壳生长速率，在数百年的记录中检测到明显的十年气候振荡。海平面气压和温度的对应分析表明，与北大西洋气候量存在大尺度遥相关。我们发现，记录项目到阻塞的情况下，在北大西洋北方。相关的环流显示出格陵兰岛和拉布拉多海上空的低压特征，以及与流向冰岛的东北气流和欧洲上空西风纬向气流减弱有关的西欧上空的高压系统。可以推测，这种循环影响控制壳生长的食物供应。在几十年的时间尺度上，记录显示了与北大西洋温度有关的明显变化。在我们的记录中，我们发现增强的变化壳增长率的几十年的时间尺度上，它似乎是这种振荡具有高振幅在16至18世纪也符合海洋烯酮数据。可以想象，这些气候振荡，也与海冰输出和增强的阻塞有关，在气候相对寒冷的时期是一个更明显的特征。(c)出版社：Elsevier B.V.
Pronounced decadal climate oscillations are detected in a multi-centennial record based on shell growth rates of the marine bivalve mollusk, Arctica islandica, from Iceland. The corresponding analysis of patterns in sea level pressure and temperature exhibit large-scale teleconnections with North Atlantic climate quantities. We find that the record projects onto blocking situations in the northern North Atlantic. The associated circulation shows a low-pressure signature over Greenland and the Labrador Sea and a high-pressure system over Western Europe associated with northeasterly flow towards Iceland and weakening in the westerly zonal flow over Europe. It can be speculated that such circulation affects food availability controlling shell growth. On multidecadal time scales, the record shows a pronounced variability linked to North Atlantic temperature. In our record, we find enhanced variability of the shell growth rates on multidecadal time scales, and it appears that this oscillation has high amplitudes in the 16th to 18th century also consistent with marine alkenone data. It is conceivable that these climate oscillations, also linked to sea ice export and enhanced blocking, are a more pronounced feature during times when the climate was relatively cold. (c) 2012 Published by Elsevier B.V.